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The weather can change quickly when we're hiking through mountain passes and alpine meadows, luckily, the Mammut Alto Light HS Hooded Jacket packs down small and offers uncompromising protection so we can brave the storms. The Mammut DRY Tour laminate keeps rain from seeping through and drenching our layers, ensuring we stay warm and dry all day long. The two zippered underarm vents allow us to control our level of ventilation, circulating out hot air on long climbs and sealing heat in as we enjoy our time on the summit. The lightweight construction and compact design allow the jacket to easily slip into our backpack, so we can pack it along for any adventure.